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Got a 2003 M3,
after hard exhilaration, when i let go of the gas peddle, and release the clutch ,the engine shuts off.

starts right up if i place it in gear, or choose to crank it with the ignition

my first assumption was that the gas used has a high content of ethanol.
used a product called Sea Foam to correct that issue and the possibility of water in the gas , but it still persists, It only occurs once the engine is warmed up, never when its cold.